TABLE 1.

Isolation of the causative STEC strains from the contact farms

Causative human STEC strainFarmSampling moNo. positive for causative strain/total no. (no. yielding stx-positive primary culture) among:
Individual cattle fecal samples (n = 159)Pooled cattle fecal samplesa (n = 17)Environmental samples (n = 122)Feed samples (n = 5)
O103:H2:stx1:eae-ε:ehxAMay6/20 (19)
June1/15 (5)0/1 (0)
October0/4 (1)0b/18 (1)
O145:H28:stx1:eae-γ:ehxB1February1/3 (1)
March0/33 (1)0/4 (0)0/22 (0)0/3 (0)
September0/27 (9)0/3 (1)0/26 (2)
B2February0/2 (2)
O174:H21:stx2cCJune1c/18 (11)
July0/26 (1)0/1 (0)0/23 (1)0/1 (0)
October1/35 (9)0/18 (1)
  • a From 3 to 13 animals.

  • b A strain related to the causative strain (showing a one-band difference in the PFGE profile) was recovered.

  • c An additional O174 strain with a four-band difference in the PFGE profile compared to that of the causative strain was recovered.